Figure 1 The cyclic dimer, built up from two dpmaH+ cations, is hydrogen-bonded to neighbouring [PdCl4]2- anions. Ellipsoids are drawn at the 50% probability level. The graph-set descriptors [R_{2}^{2}](10) and [C_{3}^{3}](11) are indicated by green and red numbers. [Symmetry codes: (') -x, -y, -z; ('') -x, -y, 1-z.]  [article HTML]